 
def get_class_value(class_name):
    if class_name == "GranularSludge":
        return 0
    elif class_name == "Epistylis":
        return 1
    elif class_name == "Floc":
        return 2
    elif class_name == "Rotifer":
        return 3
    elif class_name == "FilamentousBacteria":
        return 4

